Sparteine-Mediated Asymmetric Nucleophilic Substitution at Prochiral, sp<sup>3</sup>-Hybridized Carbon
作者:Paul Müller、Patrice Nury
DOI:10.1021/ol0062749
日期:2000.9.1
2-Phenyl-1,3-dioxolanes (1) react with organolithium reagents (2), associated with (-)-sparteine, in the presence of BF3. OEt2 to afford chiral monosubstitution products 3, Enantioselectivity is highest if both 1 and 2 carry alkyl substituents in the ortho position. However, the enantioselectivity decreases in the case of very bulky substituents such as tert-butyl or phenyl.